phaser/src/renderer/webgl/mvp/RotateY.js
2020-07-31 13:41:29 +01:00

48 lines
1.3 KiB
JavaScript

/**
* @author Richard Davey <rich@photonstorm.com>
* @copyright 2020 Photon Storm Ltd.
* @license {@link https://opensource.org/licenses/MIT|MIT License}
*/
/**
* Rotates the model matrix around the Y axis.
*
* @method Phaser.Renderer.WebGL.MVP.RotateY
* @since 3.50.0
*
* @param {Phaser.Renderer.WebGL.Pipelines.ModelViewProjection} model - The Model View Projection object.
* @param {number} radians - The amount to rotate by.
*
* @return {Phaser.Renderer.WebGL.Pipelines.ModelViewProjection} The Model View Projection object.
*/
var RotateY = function (model, radians)
{
var modelMatrix = model.modelMatrix;
var s = Math.sin(radians);
var c = Math.cos(radians);
var a00 = modelMatrix[0];
var a01 = modelMatrix[1];
var a02 = modelMatrix[2];
var a03 = modelMatrix[3];
var a20 = modelMatrix[8];
var a21 = modelMatrix[9];
var a22 = modelMatrix[10];
var a23 = modelMatrix[11];
modelMatrix[0] = a00 * c - a20 * s;
modelMatrix[1] = a01 * c - a21 * s;
modelMatrix[2] = a02 * c - a22 * s;
modelMatrix[3] = a03 * c - a23 * s;
modelMatrix[8] = a00 * s + a20 * c;
modelMatrix[9] = a01 * s + a21 * c;
modelMatrix[10] = a02 * s + a22 * c;
modelMatrix[11] = a03 * s + a23 * c;
model.modelMatrixDirty = true;
return model;
};
module.exports = RotateY;